Grabbed from MTB Kalender, an extremely popular results and race calendar site used in the Netherlands and Belgium. We used this when there quite a bit last year and have been taking pictures for a long time at Mol/Masters including last years race.

Hey Noslo! Welcome to the site...and the sport! Master's Worlds is an open event....open to anyone who has a UCI International License from your National Governing body (USA Cycling in our case) in addition to not being in the UCI top 200 men/100 women and some other criteria such as not having ridden for a UCI licensed trade team in eh year leading up to the event among some other criteria. Go and get the experience! Just bring an enormous set of cojones as you are racing many of the best ex pro racers (or current UCI pros in the case of my race last year! Drama! Ha!).